Validator CallOut Extender css change

<asp:ValidatorCalloutExtender ID="ValidatorCalloutExtender1"Enabled="True" CssClass ="customCalloutStyle" runat="server"TargetControlID ="RequiredFieldValidator1" PopupPosition="Right" CloseImageUrl ="~/images/clo.png"WarningIconImageUrl ="~/images/war.png"  >

    </asp:ValidatorCalloutExtender>

<style type="text/css">

.customCalloutStyle div, .customCalloutStyle td{

border: solid 1px Black;

background-color:#07888E;

color:White;

}

    </style>

another example :

<style>

.CustomValidator {position:relative;margin-left:-80px;}

.CustomValidator div {border:solid 1px Black;background-color:LemonChiffon; position:relative;}

.CustomValidator td {border:solid 1px Black;background-color:LemonChiffon;}

.CustomValidator .ajax__validatorcallout_popup_table {display:none;border:none;background-color:transparent;padding:0px;}

.CustomValidator .ajax__validatorcallout_popup_table_row {vertical-align:top;height:100%;background-color:transparent;padding:0px;}

.CustomValidator .ajax__validatorcallout_callout_cell {width:20px;height:100%;text-align:right;vertical-align:top;border:none;background-color:transparent;padding:0px;}

.CustomValidator .ajax__validatorcallout_callout_table {height:100%;border:none;background-color:transparent;padding:0px;}

.CustomValidator .ajax__validatorcallout_callout_table_row {background-color:transparent;padding:0px;}

.CustomValidator .ajax__validatorcallout_callout_arrow_cell {padding:8px 0px 0px 0px;text-align:right;vertical-align:top;font-size:1px;border:none;background-color:transparent;}

.CustomValidator .ajax__validatorcallout_callout_arrow_cell .ajax__validatorcallout_innerdiv {font-size:1px;position:relative;left:1px;border-bottom:none;border-right:none;border-left:none;width:15px;background-color:transparent;padding:0px;}

.CustomValidator .ajax__validatorcallout_callout_arrow_cell .ajax__validatorcallout_innerdiv div {height:1px;overflow:hidden;border-top:none;border-bottom:none;border-right:none;padding:0px;margin-left:auto;}

.CustomValidator .ajax__validatorcallout_error_message_cell {font-family:Verdana;font-size:10px;padding:5px;border-right:none;border-left:none;width:100%;}

.CustomValidator .ajax__validatorcallout_icon_cell {width:20px;padding:5px;border-right:none;}

.CustomValidator .ajax__validatorcallout_close_button_cell {vertical-align:top;padding:0px;text-align:right;border-left:none;}

.CustomValidator .ajax__validatorcallout_close_button_cell .ajax__validatorcallout_innerdiv {border:none;text-align:center;width:10px;padding:2px;cursor:pointer;}

</style>

<cc1:ValidatorCalloutExtender ID="ValidatorCalloutExtender1" runat="server" TargetControlID="MyValidatorControl" CssClass="CustomValidator">